Phonograph record resurfacing machine



2 Sheets-Sheet 1 G. H. FRITZIN'GER PnoNoeRAPH RECORD RESURFAGING MACHINE Filed oet'. 8, 1938 March 5, 1940.

lNvENToR George H. F'rzzzrzger BY #A/a ATTORNEY Patented Mar. 5, 1940 UNITED STATES PHONOGRAPH vRJEMOR) RESURFACIG MACHINE George H. Fritzinger, Orange, N. J., assignor to Thomas A.

Edison, Incorporated, West Grange, N. J., a corporation of New Jersey Application October 8,

21 Claims.

This invention relates to phonograph record resurfacing machines, and more particularly to improvements in machines of the type employed for ,shaving or resurfacing Wax-like or other records,

f such as are used in connection with commercial phonographs or dictating machines.

Records of the type described, which bear a recordation comprising a progressive groove cut 1 ,or impressed on the surface of the record, may

be prepared for re-use by a process of resurfacing. This process involves the cutting away of a layer, cr layers, of the record material of an overall thickness that is at least equivalent to the maximum depth of the grooves forming the recordation. Machines for resurfacing such records commonly comprise a rotatable support for a record to be resurfaced; a carriage which is moved steadily across the record support, as from a start position into a terminal position, while the support is rotated; a resurfacing tool on the carriage which is movable into and out of an operative position with respect to the record; and a control device for starting and stopping the operation of the machine.

In taking a rst or heavy cut on a `record there is usually cut away a surface layer of suiilcient thickness to completely obliterate the recordation. Such first or heavy cut may leave the record surface in a somewhat rough condition. In order that the record surface may, however, be rendered highly smooth, there is commonly provided a finishing-cut controlling means which, in its usual form, is arranged to advance the resurfacing tool a slight distance towards the record. During the operation of taking a first or heavy cut this finishing-cut controlling means is normally in an inoperative position; but whenever the record surface is found to be insufficiently smooth from such rst cut, the finishing-cut' 40 c ntroiling means may be moved into operative position and a second or finishing cut then taken.

t is an object of my invention to provide improved means for rendering record resurfacing machines of the above mentioned type more conveniently operable. v

It is another object of my invention to provide novel and improved means which are arranged to facilitate the operation of taking a second or finishing cut.

It is a further object to effect such facility of operation by the provision of automatically-operated means controlled by the finishing-cut controlling means.

It is another object of my invention to provide l improved means controlled and/or limited by the 193s, serial No. 233,909

finishing-cut controlling means, for starting and stopping the operation of the machine.

Itis a further object to provide an improved and simplified control device which is adapted for both manual and automatic operation, the 5 automatic operation being controlled and/or limited by the finishing-cut controlling means and being effected as an incident of completing acut on the record.

It is another object to provide improved and novel means for automatically moving the resurfacing tool out ofV operative position.

It is a further object to provide improved means for automatically moving the tool out of operative position incidental to lpredetermined 5 movements of the carriage. y

Another object is to provide means controlled by the finishing-cut contro-lling means for moving the resurfacing tool out of operative position as an incident of returning the carriage to start position.

Other and allied objects will'more fully appear from the following description and the appende claims. i f

1n the-description of my invention'reference is 25 had to the accompanying drawings, of which:

Figure 1 is a top plan View of a record resurfacing machine in which my invention is incorporated, the control device for starting and stopping the machine being shown in on position;

Fig. 2 is a vertical cross sectional View taken substantially along the line 2-2 of Fig. 1;

Fig. 3 is a fractional, vertical cross sectional View of the machine of Fig. 1, taken along the line 3-3 of Fig. 4 and otherwise generally similar to Fig. 2, but showing the carriage in an upwardly tilted position;

Fig. 4 is a top plan view of the control device for starting and stopping the machine, when this 40` device is in off position; and

Fig. 5 is a fragmentary front view of themachine as of Fig. 1, partly in section and showing the inter-relationship between the carriage, the

tion of the base plate l thereis also provided a boss 6 on which there is pivotally mounted, as by a screw l, an end-gate 8 normally held in closed position (as shown lin Fig. l) by a latch 9 pivoted to the right end portion IB of a guide rail l l which extends laterally along the forward part of the machine. The end-gate 8 supports a co-nically pointed stud l2 adjustable with respect thereto as by an adjusting screw 31.; the standard .2 supports another conically pointed stud i4 secured theretoby a set screw l5. The studs Hl and i2 form left and right thrust bearings for a shaft IG which passes through an oversized hole l? in the intermediate standard 5 and which carries a mandrel i8 for holding a cylindrical record E9 to be resurfaced. In the operation of mounting a record on, or removing a record from, the mandrel i2 the end-gate 3 is swung open to expose the right end of the mandrel. During the time the end-gate is open the shaft l is intermediately supported by the standard 5 and retained in engagement with the stud Hl by means of a collar 2G, secured to the shaft by a screw Eil', which abuts against the intermediate standard Si to limit movement of the shaft in a rightward direction.

When the end-gate 3 i l closed the mandrel I8 is rotatably supported in parallel relation to the guide rail il. Also in parallel relation to the guide rail is a laterally extending rod 2i supported by the left and right standards 2 and 3.

slidably and tiltably mounted on the rod 2i is a carriage 22 having a sleeve bearing 23 embracing the rod. As shown in Fig. 2, the carriage 22 has a relatively heavy arm 23 curved forwardly over the record l5 and terminating in a shoe 2.3 which normally slidably rests on the guide rail H. In order that the carriage 22 may be moved steadily in a leftward direction across the mandrel lf3 (as from its start position at the right end of the mandrel into its terminal position indicated in dash-dot lines in Fig. l) coincidentally with rotation of the record, there is provided a laterally extending feed screw Eil rotatably supported by the left and right standards 2 and ll and having a pulley 25 adapted to be coupled, as by a belt (not shown), to a pulley 2E on the shaft iii. Secured to the carriage sleeve 23, as by the screws 2, is a resilient and rearwardly extending arm 23 carrying a feednut 29 which normally engages the underside of the feed screw 2t. As the carriage arm 23 is tilted upwardly into a position as shown in Fig. 3, the feed-nut 29 is moved downwardly free of the feed screw 2E; the carriage may then be manually moved, at will, across the record. To limit the upward tilting of the carriage arm 23 there is provided on the carriage an angularly extending arm 3f) which is adapted to contact a stop or ridge 3i on the base plate l.

On the right side of the carriage there is a boss 32 which substantially oiverlies the rod 2l.

This boss carries a resurfacing tool 33 comprising a knife blade i1-l mounted on a knife bar 35 which is slidably supported by the boss 32 for movement towards and away from the record. The means for setting the resurfacing tool into operative position-a position of the tool in which the knife blade 34 engages the recordand for releasing the same may be of a well-known construction such as is disclosed in Luhr Patent No. l,'l2l,9l3,`issued July 23, 1929, Machine for shavingsound record tablets, but is preferably of an improved construction such as is disclosed in Brown Patent No. 2,137,383, issued November 22, 1938, and entitledVRecord shaving machine.

In the present instance, the tool-setting and releasing mechanism is sufciently described by the following statements: A cap 36 is slidably mounted on the boss 32, guided by a guide rod 3i, and suitably coupled to the knife bar 35 so that when the cap is moved downwardly towards the record the knife bar 35 is yieldably moved therewith. The cap 36 is urged upwardly by a spring 38, but upward movement of the cap 3S relative to the bar 35 is limited by a head 39 of the bar. By reason of the upward biasing of the cap 3G the knife bar 35 is normally maintained in inoperative position, this position being defined by the contact of a collar i6 on the bar 35 with the underside lll of the boss 32. The setting and release of the tool 33 is controlled by a lever #li pivoted on the right side of the boss 32 and having a short arm :i2 which is coupled to the cap 3S by an angular link 133, the link being pivoted to the arm l2 by a pin lill and to the cap 35 by a pivot screw d5; as the lever is swung forwardly in a counter-clockwise direction the cap 36 and the knife bar 35 are moved towards the record and the knife bar is thereafter locked by a locking means such as is disclosed in the abovernentioned Brown patent, thereby effecting a setting of the tool into operative position. Such forward or setting movement of the lever lli is limited to the position shown in Fig. 2 by the impingement of the link i3 against the hub iii of the lever. When the lever 4I is in this most forward position the pin lll is slightly past dead center with respect to the pivot axes of the lever 4i and the pivot screw d5. The upward biasing force exerted on the cap then causes the lever il! to be urged in a counterclockwise direction. It will therefore be apparent that when the lever 6l is moved in a counterclockwise direction into its most forward position wherein its hub 0l contacts the link G3, the lever is releasably held in that position and the tool 33 is yieldably maintained in operative position. It is also apparent that a slight tripping movement of the lever il in a clockwise direction such as to return the pin 44 across the dead center line aforementioned. will cause, by reason of the upward biasing of the cap i, the tool to be released from operative position.

inthe operation of the machine the resurfacing tool is rst set into operative position` while the carriage 22 is in an intermediate position overlying the record, the carriage is then moved into start position, and the record is then set into rotation as by a suitable motor (not shown) which may be located beneath the base plate l and be coupled to a pulley Mi on the shaft I6 as by a belt (not shown) which may pass through the opening Ill' in the base plate. As the carriage 22 is fed across the record coincidentally with the rotation of the record, a surface -layer of the record is cut away, the cut-away layer being carried by a chip chute 43 downwardly through an opening 49 in the base plate. When the carriage has reached its terminal position, the tool 33 then having traversed the record, the operator will normally do either of two things: Provided the record surface is sufficiently smooth from this first cut, he will remove the record from the machine; if, however, the record surface is insufficiently smooth from this first cut to receive another recordation, he will take another cut on the record of a light or finishing character.

In order to facilitate the taking of aiinishing out there is provided a finishing-cut controlling means by which thetool 33 may be advanced a slight distance towards the'record without disturbing the initial setting of the tool. This nishing-cut controlling means comprises a short rod 5U mounted for pivotal movement about its longitudinal axis and extending through the shoe 23 of the carriage 22 in parallel relation to the guide rail II. The rod 59 projects radially along its length below the shoe 23 throughout a minor portion of its periphery. Thus normally the carriage arm 53.3 is supported by the guide rail II by way of the rod 50. The rod 55 is, however, provided with a flat 5I throughout its length so that, as the rod is turned to bring the at 5I into contact with the guide rail ll, the carriage arm 23 is lowered slightly to advance the tool 33 towards the record. On the rod 5t there is a forwardly extending bracket 52 by which the rod 50 may be manually turned. When the bracket 52 is in the position shown in Fig. 2, the flat 5I is o the guide rail Il and the nishingcut controlling means is therefore in inoperative position; when the bracket is, however, moved upwardly into a position such as is indicated in dash-dot lines in lig.v 3, the flat 5I is in position to Icontact the guide rail and the finishing-cut controlling means is therefore in operative position.

To facilitate the removal of a record from the machine there is provided a record ejector 53 comprising a handle 54 integral with a hub 54 and an upstanding arm 55, the hub being secured by a screw 54 to a pin 55 pivotally supported by the guide rail II and the intermediate standard 5. The arm 55 carries a shoe 51 bearing a cushion 5S adapted to contact the record in the operation of ejecting a record from the mandrel I 8. The record ejector is normally maintained in an unoperated position, shown in Fig. l, as by a coil spring 59. In the operation of the ejector the handle 54 is raised against the force of the spring 59 so as to move the cushion 58 rightwardly against the record to push the record off of the mandrel I8.

Coupled to the record ejector is a mandrel brake 50 which is operated incidental to the act of operating the record ejector. The mandrel brake BEI comprises an arm 6I bearing a shoe S2 and pivoted on the pin 56. The coupling between the record ejector 53 and the brake 60 comprises a spring 63 coiled about the hub 54' of the record ejector and hooked at one end about a forwardly extending pin 'B4 on the arm 6I and at the other end about a rearwardly extending pin 55 which is on the ejector to the right of the pin 64, the pins S4 and 65 thus being normally urged together. By these means it will be seen that the shoe 52 is yieldably moved into contact with the mandrel to retard by friction the rotation of the mandrel as the record ejector 53 is operated.

The above described structure and mechanism are common to record shaving machines heretofore manufactured and used, and form a part of the present invention only in so far as they are related to or combined with other mechanism hereinafter described.

The operation of a record resurfacing machine is greatly facilitated when thel machine is automatically stopped at the completion of taking a out on the record. The operator may then immediately inspect the record surface at the completion of such cut to ascertain whether or not another cut should be taken. It is, however, de-

sirable that the operator be able to manually start and stop the machine at will. It is a feature of my invention to provide a simple form of control device, comprising but a single switch, which is manually throwable into on and off` positions to start and stop the machine, and which is moreover automatically thrown into "oif position at the completion of a cut on the record, as by the terminal movement of the carriage.

For reasons hereinafter explained, this control device is of a type which is biased into on position and which may be releasably locked in off position. Thus, the eifecting `of an off position of the control device is a matter of moving the control. device into off position and then locking the same; whereas the effecting of on position is only a matter of releasing the lock on the control device.

This control device comprises a single-pole single-throw toggle switch 66 mounted on a bracket 6'! secured by a screw 61 to the underside of the base plate I. This switch may be suitably connected by way of a two-wire cable 68 in a motor or power'supply circuit (not shown) for the machine so that the operation of the machine will be respectively stopped and started when the switch is thrown into olf and on positions. The switch 66 has an operating lever 69 which extends forwardly and then upwardly through an opening lll in the base plate I. When the lever 59 is to thel right, Aas shown in Fig. l, the switch is `vin on position; when the lever 55 is to the left, as shown in Fig. 4, the switch is in Foff position.

The means for throwing the switch 66 between on and off positions comprises a laterallyextending rod ll slidably supported by the bosses 12 and 'I3 provided on the top side of the base v'plate l and respectively disposed to the left and right of the opening l0. As may be clearly seen in Fig. 5, the rod 'II is provided with a slot M 'engaged by the upper end portion 59 of the switch operating lever 59,'the length of the slot 'I4 being slightly less than half the .length of travel of the portion 69'. The rod 'II is restrained from turning by the engagement of a screw 85 in the boss 'I3 with a longitudinal slot 86 in the rod. The rod 'il is moreover biased rightwardly by a compression spring 'I5 carried within the boss 'I2 between the rod 'I I and a plug 'I6 screwed into the boss, the rightward position of the rod .ll being defined by the impingement of a collar 'I'I, secured to the rod by a screw 'I8, against the boss 73. When the rod 'II is in its rightward posi-v tion, the switch 66 is in on position; when the rod 'II ismoved leftwardly through a distance suicient to` move the lever B9 from its rightward position to a position slightly past dead center, the lever 69 will move onward throughout the length of the slot 'M into its leftward position, by reason of vthe toggle nature of the switch, to effect the off position of the switch. When the rod 'II is so moved it becomes locked by the engagement of a pawl 'I9 with a shoulder 80 formed by reducing the diameter of a portion of the rod II. The pawl 'I9 is pivoted on an upright boss 8l by a pivot screw 82, and is biased into locking position by a spring 33 coiled about a reduced-diameter portion BI of the boss 8l and hooked about the pawl and a pin 84 on the boss.

The means for manually throwing the switch 66 comprises a manually operable lever 81 pivoted on the guide rail II by a pivot screw 88.

The llever 8l is coupled to the rod 'Il by means of a relatively short arm or lever 89 also pivoted about the pivot screw 88. The lever 89 is spaced slightly above the lever 81, as by a spacer 99 embracing the pivot screw 88, and is provided with a rounded forward end portion 89 which engages a slot 9i in the rod il as is shown in Fig. 4. Bent down from the lever 89 is a lug 92 which lies to the left of the lever 81. This lug 92 is connected by a light tension spring 93 to a downwardly bent lug 99 of a rightwardly extending arm 95 of the lever 8l.

As the lever Si is moved leftwardly it impinges against the lug 92 of the lever 89 to move the rod 'I I leftwardly to throw the switch 66 into off position. When the lever 8l reaches its off position, as is shown in Fig. 4, the pawl 19 locks the rod Il against rightward movement to retain the switch 66 in 01T position. In order that the initial rightward movement of the lever 8'! from ori to on position may unlock the switch 99, the lever 8l is provided with a pin 9G which, as the lever Sl is moved to the right, engages a cam face 97 on an arm 98 of the pawl 79 to move the pawl out of engagement with the shoulder Sii on the rod lI. It is for the reason that the lever 89 is locked against rightward movement during such initial rightward movement of the lever El, that the lever 81 is yieldably connected, as by the spring 93, to the lever 89 to permit movement of the lever 97 in a rightward direction independently of the lever 89. When the rod 7i becomes unlocked the spring 'i5 moves the rod 'il rightwardly and thereby throws the switch 99 from off to on position.

In order that the'switch may be thrown into oli position at the completion of a cut on the record, the collar *Il on the: rod 'II is provided with an upward extension 99, as may be seen in Figs. 2 and 3. On the shoe 23 of the carriage arm there is secured by the screw 199 a bracket Iii which extends downwardly in front of the guide rail I I. As the carriage moves into its terminal position, shown in Fig. 5, the bracket IUI contacts the extension 99 andthereby moves the rod ii leitwardly to eiTect the off position of the switch 5B.

If at the completion of a first or heavy cut on the record, the operator decides to take a nishing cut, the nishing-cut operation will be greatly facilitated by the provision of means for automatically restarting the machine as an incident of returning the carriage 22 to start position. To eiect such automatic restarting or the machine, the pawl 'i9 is provided with an upstanding arm Il'. On the bracket 5?. of the finishing-cut controlling means there is provided a leftwardly and downwardly extending pin 93 which lies directly behind the arm` i 92 when the carriage is in its terminal position, as is shown in Fig. 5. Upon moving the bracket iii! upwardly to place the finishing-out controlling means in an operative position, the pin Iii contacts the arm I 02 to move the arm forwardly, thereby moving the pawl 'i9 to unlock the rod il. It will, however, be seen that the switch 36 is not thrown into on position with the unlocking oi the rod II since the rod is obstructed` against rightward movement by the bracket ill while the carriage 22 is in its terminal position. Upon the return of the carriage with the nishing-cut controlling means in operative position, the switch 68 will be so thrown by the spring i5, as by .the release of the energy stored in this spring incidental to the movement or the carriage into its terminal position. With this arrangement it will be seen that should the operator move the carriage out of its terminal position with the nishing-cut controlling means in inoperative position, such as is normally done when the tool 33 is to be reset for another heavy cut, the machine will not be automatically restarted since the switch 66 remains locked in o position. After the tool 33 is reset (which resetting can only 'ce done while the record is out of rotation) the carriage is then placed into its start position and the machine is restarted by the manually operable lever 8l.

In order that the pin H13 will not impinge upon the arm I02 at the completion of a finishing cut, as would occur upon moving the carriage through the end portion of its forward travel with the finishing-cut controlling means in operative position, there is provided a rearwardly eX- tending pin I9@ on the finishing-cut controlling means which engages, as the tool moves oi of the left end of the record, a cam face IE5 on a bar R95 secured, as by welding, to the innerleftward side of the guide rail II. By such engagement the finishing-cut controlling means is fully moved into its inoperative position as the carriage moves into its terminal position.

In the normal operation of the machine, the carriage is moved out of its terminal position with the nishing-cut controlling means in inoperative position only for the purpose of resetting the tool for the taking oi a heavy cut on the record. In order to reset the tool it must oi' course be rst released from its set or operative position. In accordance with my invention this resetting of the tool is facilitated by the provision of means for automatically releasing the tool as an incident of moving the carriage out oi' its terminal position while the iinishing-cut controlling means is in inoperative position. When the carriage is partially returned, the tool may be reset with respect to the record, the carriage then returned to start position and the machine restarted. It will, however, be seen that this automatic tool-releasing means is rendered inoperative when the finishing-cut controlling means is in operative position. Thus the return of the carriage with the finishing-cut controlling means in operative position, as in the act of performing a nishing-cut operation at the completion of a rst or heavy cut on the record, will not effect the release of the tool. It may be noted that certain broad aspects of a means for automatically releasing the resurfacing tool, subject to the finishing-cut controlling means, are not claimed herein, but are claimed in a copending application of Richard M. Somers, Serial No. 272,565, filed May 9, 1939, and entitled Phonograph record resurfacing machine, which application is connected by common ownership with the present application.

The means for automatically releasing the tool 33 from operative position comprises an angular arm I9'I extending rearwardly and downwardly of the carriage and pivoted on the right side of the carriage by a pivot screw I98. Also pivoted on the screw I is a lever |99 which is spaced to the right of the arm IEI'I by a spacer II embracing the screw |98. The lever Ill9 is biased against a rightwardly extending pin III carried by the arm IDI' by a tension spring i I?. connected between a pin II3 carried by the lever M39 and a pin II4 carried by the arm IIJ'I, the lever |99 being suitably offset as along II5 so as to permit a reduction in the length of the pin III. The forward arm I99 of the lever |99 normally contacts the underside of the short arm 42 of the tool-setting lever 4I, such contact being maintained by means of a light tension spring ||6 which urges the arm |00 upwardly, the spring ||6 being connected between a pin ||1 on the carriage and the aforementioned pin carried by the arm |01. Although the arm |00 is normally urged upwardly against the arm 42, it is not urged sufficiently to effect a release of the tool 33 from operative position. Upward movement of the arm |03 is limited, as when the resurfacing tool is out of operative position, by the contact of the arm |09' with a rightwardly extending pin 32 on the boss 32.

At the lower end of the arm |01 there is provided a turned over lug in the form of a downwardly extending blade H8. On the top side of the base plate I there is secured, by the screw H9 and guiding pins |20, a short bar |2| having a cam face |22. When the carriage arm 23 is resting on the guide rail the blade ||8 clears the bar |2|, as is shown in Fig. 2. When, however, the carriage arm 23 is in an up-wardly tilted position to free the feed nut 29 from the feed screw 24, the blade ||8 is in such position as to engage the cam face |22 during the movement oi' the carriage out of its terminal position, as is shown in Fig. 3. By such engagement the arm |01 is moved forwardly and the arm |09 of the lever |09 is moved suiciently upwardly `to effect the release of the resurfacing tool 33 from operative position.

In order that the resurfacing tool will not be released by the return of the carriage when the nishing-cut controlling means is in operative position, there is provided on the right side of the carriage arm 23 a bar |23 slidably mounted by front and back shoulder screws |26 and |25 which pass through the respective front and back elongated slots |20 and |21 of. the bar |23 and thread into the respective bosses |26 and' |21 on the carriage arm. The `bar |23 is coupled to the finishing-cut controlling means by a downwardly extending arm |28, at the forward end of the bar, having a turned-over lug |29 in which there is provided an opening |30. Passing through the opening |30 is a pin |31 secured to the rod 50 of the finishing-cut controlling means. The coupling between the finishing-cut controlling means and the bar |23 is arranged so that the bar |23 is in its most forward position when the finishing-cut controlling means is in inoperative position, the bar |23 being moved into its rearward position and returned to forward position as the finishing-cut controlling means is moved into operative position and returned to inoperative position.

.The rearward end |23 of the bar |23 is provided with an angular cam face l 32 on its underside. As the bar |23 is moved into its rearward position, as by the movement of the finishingcut controlling means into operative position, the cam face |32 engages a lateral pin |33 carried by a forward extension |34 of the-aforementioned arm |09 of. the automatic tool-releasing means. By such engagement of the cam face |32 with the pin |33, the arm |09 is moved slightly downwardly free of the arm 42 of the tool-setting lever 4|, the pin |33 coming to rest in a detent |32 on the bar when the bar reaches its rearward position so as to releasably hold the finishing-cut controlling means in operative position. Thus when the finishing-cut controlling means is in operative position the arm i091 is blocked against movement to release the tool from operative position. When the finishing-cut controlling 7l' means is, however, in inoperative position the arm |09 is fully free of the bar |23 and may therefore be moved upwardly, as by the return of the carriage, to effect the release of the tool 33 from operative position. t

It will be seen that unless the arm |09 is moved downwardly through a considerable distance by the movement of the finishing-cut controlling means into operative position, the blade ||8 will yet engage the cam face |22 of the bar l2|, and the arm |01 will be thereby moved forwardly, as an incident of returning the carriage. To permit such movement of the arm |01 while 'the arm |09 is blocked against upwardfmovement, the arm |01 is resiliently connected to the lever |09 by the spring H2, as hereinbefore described. 9

Although I have herein vdescribed and illustrated a preferred embodiment of my invention it will be understood that this embodiment is subject to many changes and modifications without departure from the scope of' my invention, which I undertake to express according to the following claims.

I claim:

l. In a phonograph record resurfacing mamachine adapted `for taking cuts from a record: in combination, a carriage; a finishing-cut controlling means having operative an'd inoperative positions; a control device for starting and stopping the operation of the machine; means for causing an automatic operation of said control device incidental to predetermined movements of said carriage; and means, operatively connected with said finishing-cut controlling means, for limiting the automatic operation of said control device.

2. In a phonograph record resurfacing machine having a resurfacing tool for taking cuts from a record: in combination, av carriage movable into and out of a terminal position; a finishing-cutv controlling means associated with said tool and having operative and inoperative positions; a-`

control device for starting and stopping the operation of the machine; means for causing an automatic operation of saidl control device to stop and start the operation of the machine incidental to movements of said carriage into and out of its terminal position; and means, operatively connected with said finishing-cut controlling means, for controlling the automatic operation of said control device.

3. In a phonograph record resurfacing machine having la support for a record and means for taking cuts from the record: in combination,

trolling means associated With said tool and mov-v able into an operative position; a control device automatically operated to stop the operation of the machine as said carriage is moved into terminal position; and means for operating said control device to start the machine as said carriage is returned to start position while said iinishing-cut controlling means is in operative position.

5. In a phonograph record resurfacing machine adapted for taking cuts from a record: in combination, a movably mounted carriage; a finishing-cut controlling means having operative and inoperative positions; a device for controlling the operation of the machine having ofi and on positions, said device being biased into one of its said positions and being operated into the other of its said positions as said carriage is moved into said terminal position; releasable means for holding said device in said other position; and means, controlled by said finishing-cut controlling means, for releasing said holding means.

6. In a phonograph record resurfacing machine adapted for taking cuts from a record: in combination, a movably mounted carriage; a finishing-cut controlling means having operative and inoperative positions; a control device for said machine having on and on positions; means biasing said control device into on position; releasable means for holding said control device in off position; and means, operated as said nishing-cut controlling means is moved into operative position, for releasing said holding means.

'7. In a phonograph record resurfacing machine having a support for a record and means for taking cuts from the record: in combination, a carriage capable of forward and return movements across said support; a finishing-cut controlling means having operative and inoperative positions; a control device for said machine having on and off positions; operating means adapted to move said control device from off to on position incidental to the return of said carriage while said finishing-cut controlling means is in operative position; and means associated with said operating means to cause said control device to be retained in off position incidental to the return of said carriage while said finishing-cut controlling means is in inoperative position.

8. In a phonograph record resurfacing machine having a support for a record: in combination, a carriage capable of forward and return movements across said support; a control device comprising a single switch for starting and stopping the operation oi the machine; means for causing said control device to be automatically operated as an incident of moving said carriage through a predetermined portion of its travel; and means, operable when said carriage is out of said predetermined portion, for manually operating said control device.

9. In a phonograph record resurfacing machine: in combination, a movably mounted carriage; a switch for controlling said machine having on and off positions; means biasing said switch into one of its said positions; locking means for retaining said switch in the other of its said positions; means for operating said switch as an incident of moving said carriage; and means manually operable in one direction to release said locking means and in the other direction to operate said switch into the other of its said positions.

10. In a phonograph record resurfacing machine adapted for taking cuts from a record: in combination, a carriage movable between start and terminal positions; a nishing-cut controlling means having operative and inoperative positions; a control device having on and off positions for starting and stopping the operation of the machine; means for releasably holding said control device in oi position; means, operable when said carriage is in its terminal position, for releasing said holding means as said finishing-cut controlling means is moved into operative position; and means for automatically returning said nishing-cut controlling means to inoperative position as an incident of moving said carriage into its terminal position at the completion of a finishing out on the record.

l1. In a phonograph record resurfacing machine having a support for a record: in combination, a carriage movable across said support bctween terminal and start positions; a resurfacing tool on said carriage movable into an operative position with respect to a supported record; and means, operated incidental to the return of said carriage to start position, for moving said resurfacing tool o-ut of operative position.

l2. In a phonograph record resurfacing machine having a frame and a support for a record: in combination, a cam member on said frame; a carriage movable relative to said support; a resurfacing tool on said carriage movable into an operative position with respect to the record; and

deans, carried by said carriage and operated by said cam member as an incident of moving said carriage through a predetermined portion of its travel. for moving said resurfacing tool out of operative position.

13. In a phonograph record resurfacing ma chine having a support for a record: in combination, a carriage capable of forward and return movements across said support; a re urfacing tool on said carriage movable into operative position with respect to a supported record; a i-.nis ing-cut controlling means for advancing the tool towards the record; and means, controlled by said finishing-cut controlling means, for causing an automatic movement of said resurfacing tool out of operative position incidental to a return movement of said carriage.

14. In a phonograph record resurfacing machine having a support for a record: in combination, a carriage capable of forward and return movements across said support; a resurfacing tool on said carriage movable into an operative position relative to the record; a finishing-cut controlling means associated with said tool having an inoperative position; and means, operated incidental to the return of said carriage when said finishing-cut controlling means is in inoperative position, for moving said tool out of operative position.

15. In a phonograph record resurfacing machine having a support for a record: in combination, a carriage movable across said support; a resurfacing tool on said carriage movable into an operative position with respect to the record; a finishing-out controlling means having operative and inoperative positions; yieldable means, actuated incidental to predetermined movements of said carriage, for moving said tool out of operative position; and means, controlled in accordance with the position of said nishing-cut controlling means, for obstructing the operation of said toolmoving means.

16. In a phonograph record resurfacing machine having a support for a record: in combination, a tiltably and otherwise movably mounted carriage; a resurfacing tool on said carriage movable into operative position with respect to the record; and means, operated by movement ofthe carriage while said carriage is in a tilted position, for moving said resurfacing tool outI of operative position.

17. In a phonograph record resurfacing machine having a frame and a support fora record: in combination, a carriage movable relative to said support; a resurfacing tool on said carriage mov-v able into an operative position; anishing-cut controlling means movable into operative position to advance said tool towards the record; a cam member on said frame; means, operated by said cam member as said carriage is moved, for moving said tool out of operative position; and means,

carried by said carriage, for rendering said toolmoving means inoperative When'said finishing-cut controlling means is in operative position.

18. In a phonograph record resurfacing machine having a support for a record: in combination, a carriage; a resurfacing tool movable into operative position with relation to the record; a finishing-cut controlling means having operative and inoperative positions; means, mounted on said carriage and operated by movement of the carriage, for causing said tool to be moved out of operative position; and means for rendering said tool-moving means inoperative When said nish ing-cut controlling means is in operative position.

19. In a phonographrecord resurfacing machine having a support for a record: in combination; a carriage, a resurfacing tool on said carriage movable into operative position with respect to the record; a finishing-cut controlling means trol device for starting and stopping the opera-y tion of the machine; means for moving said tool out of operative position; and means, controlled by said finishing-cut controlling means, for operating both said control means and said tool-moving means.

20. In a phonograph record resurfacing ma-I chine adapted for taking cuts from a record: in combination, a carriage movable between terminal and start positions; control rneansy movable into on and"off positions to start and stop the operation ofthe machine; means,roperated as said carriage is moved into its terminal position, for storing energy and for moving said control means into oi position; and means for releasing said energy to move said control meansintov on position.

21. In a phonograph record resurfacing machine adapted for taking cuts from a record: in combination, a movably mounted carriage; a stationary cam member; a resurfacing tool on said carriage settable into operative position relative 'to the record; and means, mounted on said carriage andcontrolled by said cam member, for .causing said tool to be moved out of operative position incidental to a predetermined movement of the carriage.

f GEORGE H.4 FRITZINGER.

for advancing said tool towards ythe record; a. con- CERTIFICATE OF COlf'iRECTION. Patent No. 2,192,597. March 5, 191m.

p GEORGE H. Y'FRITZINGER'. A A It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, first vcolumn, line 7l, after "1929," insert --and entitled--g same page, second column, line )4.2, strike out the word "-yieldablyw and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office. y

Signed and sealed A-this` 50th day of' July, 'A. D. 191m.

I Henry `Van Arsdale, l(Seal) I 4 Acting Commissioner Aof Patents. 

